Answer:
A.
Carrying a 98 kg box across a room.
D.
Carrying a 98 kg box up the stairs
Answer: Hello, there! your answer is Below
D.
Carrying a 98 kg box up the stairs.
Explanation:
Work is done whenever a force moves something. Everyday examples of work include walking up stairs, lifting heavy objects, pulling a sledge and pushing a shopping trolley. Whenever work is done, energy is transferred from one place to another.
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The Atlantic ocean grows in size due to a
A. thrust boundary
(B. divergent boundary)
C. transform boundary
D. convergent boundary
Answer:
B. Divergent boundary
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1. How many moles of calcium are in 525g Ca?
Answer:
13.1743
Explanation:
1 grams Calcium to mol = 0.02495 mol
According to the mole concept, there are 13.12 moles of calcium in 525 g of calcium.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.Number of moles= mass/molar mass= 525/40=13.12 moles.
Thus, there are 13.12 moles of calcium in 525 g of calcium.
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How much natural gas does Canada have in reserve?
Answer:
Explanation:Marketable and technically recoverable resources
Canada's natural gas reserves are estimated to be 1,383 trillion cubic feet, of which 542 trillion cubic feet is conventional gas, and the rest is unconventional including coal-bed methane, shale and tight gas.
What eventually happens to gas if its pressureis increased?
Answer:
the rate increases
Explanation:
they are closer to each other, they will collide with each other more frequently and more successful collision
What is the molarity of a bleach solution
containing 9.5 g of Naoci per liter of
bleach
0.13M NaClO
Explanation:
9.5 g NaClO × (1 mol NaClO/74.442 g NaClO)
= 0.13 mol NaClO
Molarity = 0.13 mol NaClO/1 L
= 0.13M NaClO
Which of these choices is a benefit of international trade?
A. Loss of jobs in home country
O
B. Greater cost to transport goods
C. Fewer options for consumers
D. Lower cost for labor
The choice that is a benefit of international trade is Lower cost for labor.
When international trade is done especially if it is done in dollars then companies get more money and they have to pay less to the labours as per the own country's market. As rupees in India has lesser value than the dollars in USA that is why even some dollars are big amount of money in India. Company gets money in dollars but pay to the labours in rupees. This way it is very easy to the win the customers at lower price and also without any loss. International trade is used by a lot of fields in India now and also major in Ed tech.
International trade is the trade in which company from a particular country is providing services in the form of objects or knowledge to the other country.
Therefore, the choice that is a benefit of international trade is Lower cost for labor.
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It is the kind of interaction in which both organisms benefit from each other. *
Answer:
Mutualism
Explanation:
Intersystem crossing is: ____________. (18-13) a radiative transition between states with different spin. a nonradiative transition between the vibrational levels of the same electronic state. a nonradiative transition between states with the same spin. a nonradiative transition between states with different spin. a radiative transition between states with the same spin.
Answer:
a nonradiative transition between states with different spin.
Explanation:
In science, matter can be defined as anything that has mass and occupies space. Any physical object that is found on earth is typically composed of matter. Matter are known to be made up of atoms and as a result has the property of existing in states.
Generally, matter exists in three (3) distinct or classical phases and these are; solid, liquid and gas.
An atom can be defined as the smallest unit comprising of matter that forms all chemical elements. Thus, atoms are basically the building blocks of matters and as such defines the structure of a chemical element.
Generally, these atoms are typically made up of three distinct particles and these are protons, neutrons and electrons.
Hence, the internal arrangement of atoms in a mineral determines all of the physical properties of the mineral.
Intersystem crossing is a nonradiative transition between states with different spin. For example, a singly excited electronic state may transit into a triple excited state or a triple excited state to a single state, non radioactively.
1) 0.5 moles of sodium chloride is dissolved to make 0.05 liters of solution. 2) 734 grams of lithium sulfate are dissolved to make 2500 mL of solution. 3) a solution is made by adding 83 grams of sodium hydroxide to 750 mL of water. 4) a solution that contains .500 mol HC2H3O2 in 0.125 kg H2O. 5) a solution that contains 63.0 g HNO3 in 0.500 kg H2O. 6) What mass of water must be used to dissolve 0.500 kg C2H5OH to prepare a 3.00 m solution
Answer:
1)Molarity of 0.5 Moles of Sodium Chloride in 0.05 Liters of solution is 10 M.
2)Molarity of 734 grams of lithium sulfate are dissolved to make 2500 mL of solution is 2.68 M.
3)Molarity of a solution is made by adding 83 grams of sodium hydroxide to 750 mL of water is 2.77 M.
4)Molarity of a solution that contains .500 mol HC₂H₃O₂ in 0.125 kg H₂O is 4 M.
5)Molarity of a solution that contains 63.0 g HNO₃ in 0.500 kg H₂O is 2 M.
6)The mass of water required to form 3.0 M solution by dissolving 0.5kg of C₂H₅OH is 3.62 kg.
Explanation:
Molarity is given as
[tex]M=\dfrac{n}{V}[/tex]
Here
n is number of moles V is the volume of the solution in litersUsing this all the values are calculated as follows:
1)Molarity of 0.5 Moles of Sodium Chloride in 0.05 Liters of solution is
[tex]M=\dfrac{n}{V}\\M=\dfrac{0.5}{0.05}\\M=10[/tex]
So the molarity is 10 M.
2)Molarity of 734 grams of lithium sulfate are dissolved to make 2500 mL of solution is
[tex]M=\dfrac{n}{V}[/tex]
Here n is calculated as follows:
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}[/tex]
Here the molar mass of lithium sulphate is as follows:
[tex]MM of Li_2SO_4=2\times Li+S+4\times O\\MM of Li_2SO_4=2\times 7+32+4\times 16\\MM of Li_2SO_4=110[/tex]
So n is
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}\\n=\dfrac{734}{110}\\n=6.67[/tex]
V is given as
[tex]V_{L}=\dfrac{V_{mL}}{1000}\\V_{L}=\dfrac{2500}{1000}\\V_{L}=2.5\ L[/tex]
So the molarity is given as
[tex]M=\dfrac{n}{V}\\M=\dfrac{6.67}{2.5}\\M=2.68\ M[/tex]
So the molarity is 2.68 M.
3)Molarity of a solution is made by adding 83 grams of sodium hydroxide to 750 mL of water is
[tex]M=\dfrac{n}{V}[/tex]
Here n is calculated as follows:
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}[/tex]
Here the molar mass of Sodium hydroxide is as follows:
[tex]MM of NaOH=Na+O+H\\MM of NaOH=23+16+1\\MM of NaOH=40[/tex]
So n is
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}\\n=\dfrac{83}{40}\\n=2.075[/tex]
V is given as
[tex]V_{L}=\dfrac{V_{mL}}{1000}\\V_{L}=\dfrac{750}{1000}\\V_{L}=0.75\ L[/tex]
So the molarity is given as
[tex]M=\dfrac{n}{V}\\M=\dfrac{2.075}{0.75}\\M=2.77\ M[/tex]
So the molarity is 2.77 M.
4)Molarity of a solution that contains .500 mol HC₂H₃O₂ in 0.125 kg H₂O is
[tex]M=\dfrac{n}{V}[/tex]
V is given as
[tex]V_{L}=\dfrac{mass}{density}\\V_{L}=\dfrac{0.125}{1 kg/L}\\V_{L}=0.125\ L[/tex]
So the molarity is given as
[tex]M=\dfrac{n}{V}\\M=\dfrac{0.5}{0.125}\\M=4.0\ M[/tex]
So the molarity is 4.00 M.
5)Molarity of a solution that contains 63.0 g HNO₃ in 0.500 kg H₂O is
[tex]M=\dfrac{n}{V}[/tex]
Here n is calculated as follows:
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}[/tex]
Here the molar mass of HNO₃ is as follows:
[tex]MM of HNO_3=H+N+3\times O\\MM of HNO_3=1+14+3\times 16\\MM of HNO_3=63[/tex]
So n is
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}\\n=\dfrac{63}{63}\\n=1.00[/tex]
V is given as
[tex]V_{L}=\dfrac{mass}{density}\\V_{L}=\dfrac{0.5}{1 kg/L}\\V_{L}=0.5\ L[/tex]
So the molarity is given as
[tex]M=\dfrac{n}{V}\\M=\dfrac{1}{0.5}\\M=2.00\ M[/tex]
So the molarity is 2.00 M.
6)Mass of water must be used to dissolve 0.500 kg C₂H₅OH to prepare a 3.00 m solution is calculated as follows
[tex]M=\dfrac{n}{V}[/tex]
Here n is calculated as follows:
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}[/tex]
Here the molar mass of C₂H₅OH is as follows:
[tex]MM of C_2H_5OH=2\times C+6\times H+O\\MM of C_2H_5OH=2\times 12+6\times 1+16\\MM of C_2H_5OH=46[/tex]
So n is
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}\\n=\dfrac{500}{46}\\n=10.87[/tex]
V required is given as
[tex]M=\dfrac{n}{V}\\V=\dfrac{n}{M}\\V=\dfrac{10.87}{3}\\V=3.62\ L[/tex]
So the mass of water is given as
[tex]mass=density\times Volume\\mass=1 kg/L \times 3.62 L\\mass=3.62\ kg[/tex]
So the mass of water required to form 3.0 M solution by dissolving 0.5kg of C₂H₅OH is 3.62 kg.
How many liters of C3H6O are present in a sample weighing 25.6 grams?
To Find :
Number of moles of C₃H₆O present in a sample weighing 25.6 grams.
Solution :
Molecular mass of C₃H₆O is :
M = (6×12) + (6×1) + (16×1) grams
M = 94 grams/mol
We know, number of moles of 25.6 grams of C₃H₆O is :
[tex]n = \dfrac{Given \ Mass \ Of \ C_3H_6O }{Molar\ Mass \ Of \ C_3H_6O }\\\\n = \dfrac{25.6}{94}\ mole\\\\n = 0.27 \ mole[/tex]
Hence, this is the required solution.
CAN U JUST HELP ME PLS I NEED DESPERATE HELP. HELPPPP JUST PLS DO, IF U DON’T KNOW DON’T ANSWER :/
Answer:
i gotcha
Explanation:
-. How many moles of Pb are contained in 2.49 x 1025 atoms Pb?
Answer: There are [tex]4.13 \times 10^{-3}[/tex] moles of Pb are contained in [tex]2.49 \times 10^{25}[/tex] atoms Pb.
Explanation:
According to the mole concept, 1 mole of every substance contains [tex]6.023 \times 10^{23}[/tex] atoms.
Hence, number of moles present in [tex]2.49 \times 10^{25}[/tex] atoms of Pb are as follows.
[tex]No. of moles = \frac{2.49 \times 10^{25}}{6.023 \times 10^{23}}\\= 4.13 \times 10^{-3} mol[/tex]
Thus, we can conclude that there are [tex]4.13 \times 10^{-3}[/tex] moles of Pb are contained in [tex]2.49 \times 10^{25}[/tex] atoms Pb.
on the planet mars the average night temperature is 24k. what is the temperature in degrees celsius and degree fahrehheit
(07.01 LC)
Which of the following happens during an exothermic chemical change? (4 points)
Net energy increases.
Heat is absorbed.
Net energy remains constant.
Heat is released.
Answer:
heat is released
Explanation:
there is a release of energy to the surroundings resulting in a net decrease
Heat is released during an exothermic chemical change. Hence, option D is correct.
What is an exothermic reaction?The process in which energy is released where bonds are broken is an exothermic reaction.
For example, combustion is an exothermic reaction where initially energy input along with oxygen and wax react to give heat, carbon dioxide and water.
An exothermic reaction is a "reaction in which standard enthalpy change ΔH⚬ is negative." Exothermic reactions release heat and entail the replacement of weak bonds with a stronger bonds.
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The combustion of 3.795 mg of liquid B, which contains only C, H, and O, with excess oxygen gave 9.708 mg of CO2 and 3.969 mg of H2O. In a molar mass determination, 0.205 g of B vaporized at 1.00atm and 200.0'C and occupied a volume of 89.8 mL. Derive the empirical formula, molar mass, and molecular formula of B and draw three plausible structures
Answer:
Explanation:
9.708 mg of CO₂ will contain 12 x 9.708 / 44 = 2.64 g of C .
3.969 mg of H₂O will contain 2 x 3.969 / 18 = .441 g of H .
mg of O in given liquid B = 3.795 - ( 2.64 + .441 ) = .714 mg
ratio of mg of C , H , O in the compound = 2.64 : .441 : .714
ratio of no of atoms of C , H , O in the compound
= 2.64 / 12 : .441 /1 : .714 / 16
= .22 : .44 : .0446
= .22 / .22 : .44 / .22 : .044 / .22
= 1 : 2 : .2
1 x 5 : 2 x 5 : .2 x 5
= 5 : 10 : 1
empirical formula of the compound = C₅H₁₀O
Volume of 89.8 mL at 1 .00 atm at 200⁰C
volume of gas at 1 atm and 0⁰C = 89.8 x 273 / 473 mL
= 51.83 mL
51.83 mL weighs .205 g
22400 mL will weigh .205 x 22400 / 51.83 g
= 88.6 g
So molecular weight = 88.6
Let molecular formula be (C₅H₁₀O)ₙ
molecular weight = n ( 5 x 12 + 10 + 16 )
= 86 n
86 n = 88.6
n = 1 approx
So molecular formula is same as empirical formula
C₅H₁₀O is molecular formula .
2C How many valence electrons does the atom have? A. 1 C. 5 B. 3 D. 7 i need help.
Answer:
C
Explanation:
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Construction of a voltaic cell Consider a cobalt-silver voltaic cell that is constructed such that one half-cell consists of the cobalt, CoCo, electrode immersed in a Co(NO3)3Co(NO3)3 solution, and the other half-cell consists of the silver, AgAg, electrode immersed in a AgNO3AgNO3 solution. The two electrodes are connected by a copper wire. The CoCo electrode acts as the anode, and the AgAg electrode acts as the cathode. To maintain electric neutrality, you add a KNO3KNO3 salt bridge separating the two half-cells.
The half-cell is a chamber in the voltaic cell where one half-cell is the site of the oxidation reaction and the other half-cell is the site of the reduction reaction. Type the half-cell reaction that takes place at the anode for the cobalt-silver voltaic cell. Indicate the physical states of atoms and ions using the abbreviation (s), (l), or (g) for solid, liquid, or gas, respectively.
Answer:
Co(s) ------> Co^3+(aq) + 3e
Explanation:
A voltaic cell produces energy by spontaneous chemical processes. A voltaic cell contains an anode and a cathode. Oxidation (electron loss) occurs at the anode while reduction (electron gain) occurs at the cathode.
For the cobalt-silver voltaic cell, the reaction equation of the cobalt and silver voltaic anode half cell is shown;
At the anode;
Co(s) ------> Co^3+(aq) + 3e
Note that the anode is the electrode where oxidation occurs hence electrons are lost at the anode.
Determine which base will work to deprotonate each compound in an acid/base extraction.
Benzene ring with a carboxylic acid on one carbon and a methyl ester group on the opposite carbon __________
Benzene ring with a three carbon chain attached to one carbon. At the other end of the three carbon chain is a hydroxyl group. ___________
Benzene ring with a hydroxyl group attached to one carbon and a tertbutyl group attached to the opposite carbon __________-
Answer:
A common method is to perform an acid-base reaction, which can ... acid is not particularly water-soluble due to its nonpolar aromatic ring, ... An acid-base extraction can be used to extract carboxylic acids from ... carbonic acid (H2CO3) can decompose to water and carbon dioxide gas.
Explanation:
The bases that will work to deprotonate the compounds are :
NaHCO₃ or NaOH.metal alkoxidesNaOHThe Benzene ring with carboxylic acid which is a weak acid can be deprotonated using NaOH or NaHCO₃ because of the weakness of the carboxylic acid.
Metal alkoxides like potassium tertiary butoxide can be used to deprotonate a Benzene ring with three carbon chain attached to a single carbon, and also containing a hydroxyl group is a very weak acid hence the use of Metal alkoxides.
Benzene ring with a hydroxyl group attached is also a weak acid just like the Benzene ring with carboxylic group hence it can also be deprotonated using NaOH
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What is the MOST LIKELY reason that they build these layers? A. Help them capture food because their calcium carbonate exterior keeps them from drying out in their specific environment. B. Help them capture food because their calcium carbonate exterior allows them to withstand an attack from their predators in their specific environment. C. Protect them from predators because their calcium carbonate exterior allows them to withstand an attack from their predators in their specific environment. D. Protect them from predators because their calcium carbonate exterior keeps them from drying out in their specific environment.
Answer:
C. Protect them from predators because their calcium carbonate exterior allows them to withstand an attack from their predators in their specific environment.
Explanation:
They build layers to protect themselves from predators. Plus, I've seen this question and got it right.
How many grams of ethanol, C2H5OH, can be boiled with 843.2 kJ of heat energy? The molar heat of vaporization of ethanol is 38.6 kJ/mol.
Answer:
1.00 × 10³ g
Explanation:
Step 1: Given data
Provided heat (Q): 843.2 kJMolar heat of vaporization of ethanol (ΔH°vap): 38.6 kJ/molStep 2: Calculate the moles of ethanol vaporized
Vaporization is the passage of a substance from liquid to gas. We can calculate the number of moles (n) vaporized using the following expression.
Q = ΔH°vap × n
n = Q / ΔH°vap
n = 843.2 kJ / (38.6 kJ/mol) = 21.8 mol
Step 3: Calculate the mass corresponding to 21.8 moles of ethanol
The molar mass of ethanol is 46.07 g/mol.
21.8 mol × 46.07 g/mol = 1.00 × 10³ g
The conversion of the liquid into water vapor is called vaporization.
The correct answer to the question is [tex]1.00 * 10^3 g[/tex]
The data given in the question is as follows:-
Provided heat (Q): 843.2 kJ Molar heat of vaporization of ethanol (ΔH°vap): 38.6 kJ/molThe formula we will use to calculate the moles is as:-
[tex]Q = H^ovap* n\\n = \frac{Q}{H^ovap}\\n = \frac{843.2 kJ}{(38.6 kJ/mol)} \\\\= 21.8 mol[/tex]
To calculate the mass of the following is as follows:-
The molar mass of ethanol is 46.07 g/mol.
[tex]21.8 mol* 46.07 g/mol = 1.00 * 10^3 g[/tex]
Hence the correct answer is [tex]1.00 * 10^3 g[/tex].
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How does high pressure effect the solubility of a gas?
Answer:
Gases as might be expected, increase in solubility with an increase in pressure. Henry's Law states that: The solubility of a gas in a liquid is directly proportional to the pressure of that gas above the surface of the solution. ... When the bottle is opened, the pressure above the solution decreases.
Answer:High pressure increases the solubility.
Explanation: i just took the quiz
A mole of a substance has a mass in grams that is equal to the molecular mass. For example, a carbon atom has a mass of 12.01 u. A mole of carbon has a mass of 12.01 g. Based on their molecular masses, list the molar massof each substance:Fe2O3__________CO __________Fe __________CO2__________ slader
Answer:
M(Fe₂O₃) = 159.70 g/mol
M(CO) = 28.01 g/mol
M(Fe) = 55.85 g/mol
M(CO₂) = 44.01 g/mol
Explanation:
We can calculate the molar mass of a compound by summing the molar masses of the elements that form it.
Fe₂O₃
M(Fe₂O₃) = 2 × M(Fe) + 3 × M(O) = 2 × 55.85 g/mol + 3 × 16.00 g/mol = 159.70 g/mol
CO
M(CO) = 1 × M(C) + 1 × M(O) = 1 × 12.01 g/mol + 1 × 16.00 g/mol = 28.01 g/mol
Fe
M(Fe) = 1 × M(Fe) = 1 × 55.85 g/mol = 55.85 g/mol
CO₂
M(CO₂) = 1 × M(C) + 2 × M(O) = 1 × 12.01 g/mol + 2 × 16.00 g/mol = 44.01 g/mol
What compound of
calcium is used
for makings refraction furnace linings
A 0.250 g sample of impure sodium carbonate required 18.29ml of 0.1055M HCI in a titration to methyl orange end point. The
percent of Na2CO3 (FW 106 g/mol)in the sample.
Select one:
O a. 10.23%
O b. 42.91%
O c. 40.905%
O d. 20.46%
Answer:
a
Explanation:
Observe the above circuit diagram, if the gap is filled with a plastic wire, will the bulb glow? Justify your answer
Answer:
YES THE BULB WILL GLOW.
Explanation:
BECAUSE THE CIRCUIT UPPER AREA IS MADE OF PLASTIC SO THE PLASTIC CONDUCTS THE ELECTRICITY SO THE BULB WILL GLOW.
What are slime Molds?
Answer:
Slime mold or slime mould is an informal name given to several kinds of unrelated eukaryotic organisms that can live freely as single cells, but can aggregate together to form multicellular reproductive structures. Slime molds were formerly classified as fungi but are no longer considered part of that kingdom.
Answer:
Molds to put slime in
Explanation:
Which of the following describes the location of the polar climate zone? (2 points)
Group of answer choices
Between the tropical and the temperate zones
Closest to the equator
Farthest from the equator
Near the North Pole and South Pole
Answer:
Which of the following describes the location of the polar climate zone? Near the North Pole and South Pole.
In redox reactions, the reactant that is oxidized is also called the _________.
a. oxidizing agent.
b. reducing agent.
c. reductant.
d. oxidant.
In redox reactions, the reactant that is oxidized is also called the reducing agent and is denoted as option B.
What is a Reducing agent?These are compounds which take part in a chemical reaction and lose their electrons in the process.
This leads to them becoming oxidized in a redox reaction and then acts as a reducing agent to the other compound.
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there are two correct answers, reducing agent, and reductant
How many calories of energy are found in 8.3 grams or Fat? Every gram of fat
can produce 38 KJ of energy.
Answer: asd asd asd asdasdasdasd
Which of the following elements will form negative ions? Check
all that apply.
Answer:
Explanation:
Elements on the right side of the periodic table are very likely to form negative ions -- all of those except elements in the 8th or 18th column (depending on how your periodic table is numbered).
K and Mg are on the left side, so they will not form negative ions.
They give up 1 (for K) electron and 2 (for Mg) electrons which will leave plus charges for the ions.
On the other hand S and I are on the right side of the periodic table. They will take on electrons and hence be charged with a minus.